Automatic tool-forging machine.



L. H. KUNKLE. l n AUTDMATIG TOOL PORGING MACHINE.

APPLIQATION FILED 11017.21, 1910. 999,661 Patented Aug. 1,1911.

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WMe/aow L. H. KUNKLE. AUTOMATIC TooL PORGING MACHINE.

APPLICATION FILED NOV. 21, 1910. l 999,661 Patented Aug. 1,1911.

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LORENZA H. KUNKLE, 0F ALTOONA, PENNSYLVANIA.

AUTOMATIC TOOL-FORGING- MACHINE.

Specification of Letters Patent.

Patented Aug. 1, 1911.

Application filed November 21, 1910. Serial No. 593,488.

To all lwhom it may concern:

Be it known that I, LORENZA H. KUNKLE, a citizen of the United States ofAmerica, residing at Altoona, in the county of Blair and State ofPennsylvania, have invented new and useful Improvements in AutomaticTool-Forging Machines, of which the following is a specification.

This invention relates to machines for forging chisels, drills and othertools of a like description, and it has for its object to produce amachine of this character including a plurality of dies and hammerscoacting therewith, said hammers being operable by means of compressedair or other iiuid pressure, such as steam, and the parts of theinvention being arranged for coperation in such a manner that a blankhandled by one operator may at a single heat be forged into a tool ofthe desired description,

A further object of the invention is to simplify7 and improve thearrangement of the dies and the hammers to produce a convenient andefficient organized machine.

Further objects of the invention are to simplify and improve the generalconstruction and operation of a machine of the character described.-

Vith these and other ends in view which will readily appear as thenature of the invention is better understood, the same consists in theimproved construction and novel arrangement of part-s which will behereinafter fully described and particularly pointed out in the claim.

In the accompanying drawings has been illustrated a simple and preferredform of the invention, it being, however, understood that no limitationis necessarily made to the precise structural details therein exhibited,but that changes, alterations and modifications within the scope of theclaim may be resorted to when desired.

In the drawings,-Figure1 is a front elevation of a machine constructedin accordance with the invention. Fig. 2 is a horizontal sectional viewtaken on the plane indicated by the line 2 2 in Fig. 1. Fig. 3 is avertical sectional detail view taken on the line 3-3 in Fig. 2. Fig. 4is a vertical transverse sectional view taken on the line 4 4 in Fig. 1.Figs. 5 and 6 are sectional detail views, enlarged, taken lon the lines5 5 and 6-6 in Fig. 4.

Corresponding parts in the several figures are denoted by likecharacters of reference.

The frame of the improved machine comprises a bridge beam l supported atthe ends thereof by legs or uprights 2, 2, said bridge beam beingpreferably trussed or reinforced upon its underside and provided uponits flat upper face with transverse dovetailed recesses 3, 3 for thereception of dies 4, 4, the undersides of which are provided withdovetailed projections 5 to engage the recesses 3, thus enabling thesaid dies to be mounted very securely in position but in such a manneras to enable said dies to be readily interchanged for other dies of adifferent shape.

The bridge beam l is'provided with uprights 5, 5 rising from the endsthereof and supporting a cap beam 6 which may likewise be trussed orreinforced and upon the underside of which a plurality of cylinders 7are mounted or supported in registry with the die receiving recesses 3in the bridge beam. Each of said cylinders contains a piston 8 having astern 9 that extends through the head at the lower end of the cylinderand carries a hammer 10 with which a die 11 is associated, it beingunderstood that the die 1l may be either integral with or suitablyconnected with the hammer, the latter being detachably connected withthe piston stem 9 by means of a set screw 12 or in any other convenientmanner. It will be seen that the die 11 and the hammer 10 combine toform a striking element which, as a whole, is designated by C, saidstriking element being detachably associated with the piston stem 9.

Each of the cylinders 7 has associated therewith a valve chest 13wherein a slide valve 14 is mounted for reciprocation, said slide valvebeing provided with laterally eX- tending lugs 15, 16 that lie in thepath of the upper and lower ends of the piston, thereby causing the saidvalve to be actuated by the reciprocation of said piston. The valve 1liis provided with ports or apertures 17, 18 adapted to register with theinlet port 19 and the exhaust port 20, respectively. rlhe inlet port 19communicates through a pipe 21 having a stop valve 22 with a storagereservoir 23 for compressed air or other fluid; said reservoir being inturn connected by a pipe 211 with pump 25. Said pump is connected withand adapted to exhaust the air from a vacuum chamber 26 which isconnected by a pipe Q7 with the exhaust port 2O of the cylinder. Any'ordinary single or double acting` pump may be used to compress andexhaust the fluid whereby the piston is reciprocated in the cylinder. 1twill also be understood that a single pump with appended storage andvacuum chambers may be utilized to furnish motive power for any desirednumber of cylinders.

Each of the stop valves 22 is provided with a lever 28 which isconnected b y a link 29 with a foot lever 30 whereby said valve may beactuated. Each foot lever is preferably actuated by a spring 31 wherebyit is moved to a valve closing position. By placing his foot upon thetreadle of the foot lever, the operator may open any one of the valves22, thereby placing the cylinder with which such valve is associated incommunication with the source of supply of motive fluid.

In the construction of this machine the piston stems carrying thestriking elements C are preferably made non-circular, so as to maintainthe dies of the striking elements in perfect alinement with the diemembers 4 supported upon the bridge beam 1 of the machine. It will alsobe understood that the die members supported upon the bridge beam andthe cooperating striking members carried by the piston stems constitutea complete set of dies whereby a suitable blank may be graduallyconverted into a tool of any desired description, the evolution of thefinished tool from the original blank being accomplished by thesuccessive operation of as many dies as may be required for the purpose,each die being composed of a stationary member e and a striking elementC. The operator, carrying the blank by means of suitable tongs orholders, moves from one die to another, successively subjecting theblank to the action of the several dies until the forging operation iscompleted, this being accomplished at a single heat. After beingsubjected to the operation of the in ishing die the blank subjected to atempering operation which, however, is no part of the present invention.

In the hand forging of tools of various kinds the operator requires theassistance of a helper, and the forging operation is necessarily acomparatively slow one, frequently requiring several heat-s. By means ofthe improved machine herein described a single operator may greatlyincrease the out-put which will also be found to be of a superior anduniform quality. By depressing the treadle 30 the operator opens thevalve 22, thus placing the upper end of the cylinder associated with thetreadle in communication with the storage reservoir 23 through the ports17, 19, causing the piston to be forcibly depressed by the fluidpressure on the reservoir 23. Vhen the piston approaches the downwardlimit of its movement it encounters the projection 15 of the valve 14,which latter is thus moved to place the ports 18, 20 in registry whilethe ports 17, 19 are mutually obstructed, thus placing the upper end ofthe cylinder in communication with the vacuum chamber 26, whereby theair or fluid above the piston will be exhausted, causing the piston andparts 4connected therewith to be projected upwardly by the pressure ofthe air below the piston. Vhen the piston approaches the upward limit ofits movement, it will engage the projection 15 of the slide valve 14,shifting the latter to place the ports 17, 19 in registry, thus impeiling the piston downwardly, the reciprocatory movement of the pistonbeing continued as long as the valve 22 is open.

The improved machine, moreover, is not merely useful for the purpose offorging new tools, but also for the purpose of restoring and sharpeningtools that have been in use for some time.

Such tools as rock drills, chisels and the like may be quickly andeffectively resharpcned by the improved machine at a very tritlingexpense.

1t will be understood that while this invention has been described as atool forging machine, the use thereof is not necessarily limited, butthe machine may be utilized for a variety of purposes which will readilysuggest themselves.

It will also be seen that the machine is practically automatic in itsoperation, the only action required to be performed by the operatorbeyond placing the article to be operated upon the lower die memberbeing to depress the foot lever whereby the valve controlling theadmission of the mot-ive fluid is operated. It follows that the work maybe readily accomplished by a single operator without the assistance of ahelper.

Having thus described the invention, what is claimed as new, is

In a tool forging machine, a frame including a bridge beam and a capbeam, a die member supported detachably upon the bridge beam, a cylindersupported upon the cap beam and having a 4chest provided with inlet andexhaust ports, a slide valve movable in the chest and having aperturesadapted to register with the inlet and the exhaust ports, a pistonmounted for reciproca- LORENZA H. KUNKLE.

tion in the cylinder, lugs extending from the Valve and lying in thepath of the piston, a pump7 a Storage reservoir connected With theoutlet of the pump, a Vacuum reservoir oonnectecl with the inlet of thepump, 9, duet connecting the vacuum Chamber with the eX- haust port ofthe cylinder, a valved duet connecting the cylinder inlet With the storWitnesses:

WM. BAGGER, BENNETT S. JONES.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

